# 字符串表示
s1 = "字符串'"
s2 = '字符串'
s3 = '''字符串'''
s4 = """字符串"""
print(s1)
print(s2)
print(s3)
print(s4)

# 字符串嵌套：外双内单,外单内双,双双单单用\转义
s1 = '字符串: "s"'
s2 = "字符串: 's'"
s3 = '字符串: \'s\''
s4 = "字符串: \"s\""
print(s1)
print(s2)
print(s3)
print(s4)
